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Träfflista för sökning "WFRF:(Laegsgaard E) srt2:(2001)"

Sökning: WFRF:(Laegsgaard E) > (2001)

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1.
  • Laegsgaard, E, et al. (författare)
  • A high-pressure scanning tunneling microscope
  • 2001
  • Ingår i: Review of Scientific Instruments. - : AIP Publishing. - 0034-6748 .- 1089-7623. ; 72:9, s. 3537-3542
  • Tidskriftsartikel (refereegranskat)abstract
    • We present the design and performance of a high-pressure scanning tunneling microscope (HP-STM), which allows atom-resolved imaging of metal surfaces at pressures ranging from ultrahigh vacuum (UHV) to atmospheric pressures (1 x 10(-10)-1000 mbar) on a routine basis. The HP-STM is integrated in a gold-plated high-pressure cell with a volume of only similar to0.5 l, which is attached directly to an UHV preparation/analysis chamber. The latter facilitates quick sample transfer between the UHV chamber and the high-pressure cell, and allows for in situ chemical and structural analysis by a number of analytical UHV techniques incorporated in the UHV chamber. Reactant gases are admitted to the high-pressure cell via a dedicated gas handling system, which includes several stages of gas purification. The use of ultrapure gasses is essential when working at high pressures in order to achieve well-defined experimental conditions. The latter is demonstrated in the case of H/Cu(110) at atmospheric H-2 pressures where impurity-related structures were observed. (C) 2001 American Institute of Physics.
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2.
  • Österlund, Lars, 1967-, et al. (författare)
  • Bridging the pressure gap in surface science at the atomic level : H/Cu(110)
  • 2001
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 86:3, s. 460-463
  • Tidskriftsartikel (refereegranskat)abstract
    • The structural response of the Cu(110) surface to H-2 gas pressures ranging from 10(-13) to 1 bar is studied using a novel high-pressure scanning tunneling microscope (HP-STM). We find that at H-2 pressures larger than 2 mbar the Cu(110) surface reconstructs into the (1 X 2) "missing-row" structure. From a quantitative analysis of the pressure dependence of the surface reconstruction, we conclude that Cu(110) responds identically to hydrogen at ultrahigh vacuum conditions and at atmospheric pressures. From the HP-STM data, we extract refined values for the adsorption and desorption rate constants.
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  • Resultat 1-2 av 2
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tidskriftsartikel (2)
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refereegranskat (2)
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Österlund, Lars, 196 ... (2)
Laegsgaard, E (2)
Thostrup, P (2)
Rasmussen, P B (2)
Stensgaard, I (2)
Besenbacher, F (2)
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Uppsala universitet (2)
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Engelska (2)
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2001 (2)Ta bort avgränsningen

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